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Figure 5 Echolucent coronary plaque imaged in vivo by optical coherence tomography (OCT) (A) and intravascular ultrasound (IVUS) (B). (A) This plaque demonstrates a homogeneous, signal-poor region (inset, arrow) by OCT that extends near the vessel lumen at the shoulder of the plaque (inset, arrowheads), possibly representing a vulnerable shoulder region. The minimum cap thickness at this region measured 20 ± 3 µm by OCT. (B) The echolucent region (arrow) is also identified in the IVUS image from the same site; but the cap is difficult to visualize, and its thickness cannot be measured. Tick marks, 1 mm.
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